There is a lot of talk on the subject of fast charging in the electric vehicle world. In principle, you cannot have both high energy density AND fast charging built into the same battery. There are many reasons for this, however, the graphite anode is the main block to fast charging. Currently “power” cells with graphite anodes can charge as fast as 75% in 15 minutes while “energy” cells require >1.5 hours. Future anodes such as silicon may bring larger capacities AS WELL AS faster rates of charging. Enevate discloses how in this patent. Listen to my podcast to learn more.
Sakamoto group page: https://sakamoto.engin.umich.edu/people/
Plating lithium metal anodes through inorganic solid electrolytes is challenging and slow due to proliferation of dendrites along the grain boundary where ionic conductivity is higher. Sakamoto’s group shares evidence of rate improvements without dendritic growth with LLZO solid electrolytes.
Sion Power has been a leader in batteries with lithium metal for more than 20 years. Traditionally championing lithium-sulfur batteries, it has recently expanded into high energy density batteries with lithium metal and traditional high voltage cathodes such as NMC622/811, etc. It’s Licerion product offers a 20Ah pouch cell, 500 Wh/kg, 1000 Wh/l with an impressive EOL of 80% after 500 cycles at C/3. In this podcast i discuss its 2018 patent on the importance of (anisotropic) pressure applied to cells with lithium metal anodes. Enjoy!
A lithium metal electrode and its related lithium metal battery is disclosed in the present invention. The lithium metal electrode comprises a current collector, a lithium metal layer, an insulation frame, a porous electrical insulation layer and an ionic diffusion layer. The current collector has at least a well. The lithium metal layer is disposed on the bottom surface of the well. The insulation frame is disposed alone the opening of the well. The insulation frame extends radially outward the opening to cover a top surface of the current collector partially and extends vertically toward the inner sidewall of the well. The lithium dendrites will mostly plate in the well and will not plate upwards due to the inhibition layer. Hence, the lithium dendrites will not penetrate through the electrical insulator so that the safety of the lithium metal battery can be improved greatly.